Why was the sahel’s location important to the early empire of ghana? ?

The idea that desirable traits can be bred into human beings and undesirable ones can be bred out is known as:

Which of the following discoveries would be most likely to cause a scientific paradigm shift? a. the discovery of more rings around uranus b. the discovery of a new pathogenic virus transmitted by mosquitoes c. the discovery that a dormant volcano is showing signs of activity d. the discovery of a new species of salamander in the amazon rainforest e. the discovery that excess heat is radiating from the center of the earth and causing global climate change

Why did the settlement of east texas stop in the late 1710s